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M29W320DT Datasheet(PDF) 13 Page - STMicroelectronics

Part No. M29W320DT
Description  32 Mbit 4Mb x8 or 2Mb x16, Boot Block 3V Supply Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M29W320DT Datasheet(HTML) 13 Page - STMicroelectronics

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M29W320DT, M29W320DB
Signal descriptions
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2.7
Write Enable (W)
The Write Enable, W, controls the Bus Write operation of the memory’s Command Interface.
2.8
VPP/Write Protect (VPP/WP)
The VPP/Write Protect pin provides two functions. The VPP function allows the memory to
use an external high voltage power supply to reduce the time required for Unlock Bypass
Program operations. The Write Protect function provides a hardware method of protecting
the 16 Kbyte Boot Block. The VPP/Write Protect pin must not be left floating or unconnected.
When VPP/Write Protect is Low, VIL, the memory protects the 16 Kbyte Boot Block; Program
and Erase operations in this block are ignored while VPP/Write Protect is Low.
When VPP/Write Protect is High, VIH, the memory reverts to the previous protection status
of the 16 Kbyte boot block. Program and Erase operations can now modify the data in the 16
Kbyte Boot Block unless the block is protected using Block Protection.
When VPP/Write Protect is raised to VPP the memory automatically enters the Unlock
Bypass mode. When VPP/Write Protect returns to VIH or VIL normal operation resumes.
During Unlock Bypass Program operations the memory draws IPP from the pin to supply the
programming circuits. See the description of the Unlock Bypass command in the Command
Interface section. The transitions from VIH to VPP and from VPP to VIH must be slower than
tVHVPP, see Figure 13.
Never raise VPP/Write Protect to VPP from any mode except Read mode, otherwise the
memory may be left in an indeterminate state.
A 0.1µF capacitor should be connected between the VPP/Write Protect pin and the VSS
Ground pin to decouple the current surges from the power supply. The PCB track widths
must be sufficient to carry the currents required during Unlock Bypass Program, IPP.
2.9
Reset/Block Temporary Unprotect (RP)
The Reset/Block Temporary Unprotect pin can be used to apply a Hardware Reset to the
memory or to temporarily unprotect all Blocks that have been protected.
Note that if VPP/WP is at VIL, then the 16 KByte outermost boot block will remain protect
even if RP is at VID.
A Hardware Reset is achieved by holding Reset/Block Temporary Unprotect Low, VIL, for at
least tPLPX. After Reset/Block Temporary Unprotect goes High, VIH, the memory will be
ready for Bus Read and Bus Write operations after tPHEL or tRHEL, whichever occurs last.
See the Ready/Busy Output section, Table 15 and Figure 12, for more details.
Holding RP at VID will temporarily unprotect the protected Blocks in the memory. Program
and Erase operations on all blocks will be possible. The transition from VIH to VID must be
slower than tPHPHH.


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